Synthesis, structural and spectroscopic studies of 2-oxoacenaphthylen-1(2H)-ylidene nicotinohydrazide.

The synthesis of a new hydrazone, 2-oxoacenaphthylen-1(2H)-ylidene nicotinohydrazide, and its structural and spectroscopic characterization is reported. The obtained powder was recrystallized from DMSO and ethanol that afforded small crystals used for single-crystal X-ray diffraction studies. The compound was found to crystallize in two polymorphs, depending on the crystallization conditions. One of the polymorphs (form I) crystallizes in the centrosymmetric P21/c monoclinic space group, the other (form II) crystallizes in the non-centrosymmetric, but achiral, orthorhombic space group P212121. Conformation of the molecules is similar in both polymorphs, but the network of weak intermolecular interactions determining the crystal packing is different. In form II an additional C-H⋯O bond connects molecules related by the screw-axis running parallel to the a-axis. Crystals of both polymorphs were also screened by FT-IR and Raman microscopy; a detailed analysis of the spectra and comparison with those of the isolated molecule calculated by ab-initio HF/MP2 and DFT/B3LYP methods using a correlation consistent cc-pVDZ basis set is presented. In addition, UV-vis and NMR studies were performed in solution.

Long-term outcomes of oral rehabilitation with dental implants in HIV-positive patients: A retrospective case series.

BACKGROUND: The existing information on oral rehabilitations with dental implants in VIH-positive patients is scarce and of poor quality. Moreover, no long-term follow-up studies are available. Hence, the aims of this study were to describe the long-term survival and success rates of dental implants in a group of HIV-positive patients and to identify the most common postoperative complications, including peri-implant diseases. MATERIAL AND METHODS: A retrospective case series of HIV-positive subjects treated with dental implants at the School of Dentistry of the University of Barcelona (Spain) was studied. Several clinical parameters were registered, including CD4 cell count, viral load and surgical complications. Additionally, the patients were assessed for implant survival and success rates and for the prevalence of peri-implant diseases. A descriptive statistical analysis of the data was performed. RESULTS: Nine participants (57 implants) were included. The patients' median age was 42 years (IQR=13.5 years). The implant survival and success rates were 98.3% and 68.4%, respectively, with a mean follow-up of 77.5 months (SD=16.1 months). The patient-based prevalence of peri-implant mucositis and peri-implantitis were 22.2% and 44.4% respectively at the last appointment. Patients that attended regular periodontal maintenance visits had significantly less mean bone loss than non-compliant patients (1.3 mm and 3.9 mm respectively). CONCLUSIONS: Oral rehabilitation with dental implants in HIV-positive patients seems to provide satisfactory results. In order to reduce the considerably high prevalence of peri-implant diseases, strict maintenance programmes must be implemented.

Fibroma osificante periférico: Presentación de tres casos y revisión de la literatura / Peripheral ossifying fibroma: Report of three cases and review of the literature

El fibroma osificante periférico (FOP) es una entidad benigna que se incluye en el grupo de las lesiones gingivales reactivas, denominadas con el término genérico de épulis, y se origina, según la teoría más aceptada, en las células del ligamento periodontal. Se manifiesta en forma de tumoración de consistencia firme, bien circunscrita, de color rosado o rojizo y está situada normalmente en la zona incisivo-canina del maxilar superior, siendo rara su aparición en crestas edéntulas. Aparece a cualquier edad, con una mayor incidencia entre la segunda y tercera décadas de la vida, con una ligera predilección por el sexo femenino. Es una lesión de partes blandas, que en ocasiones puede estar asociada a una ligera erosión superficial del hueso subyacente. Se han revisado 3 casos de FOP que afectaban a 2 hombres y 1 mujer de edades comprendidas entre los 39 y los 73 años, presentándose uno de ellos en una cresta alveolar edéntula. En dos casos se observaba radiográficamente una ligera erosión del hueso subyacente y el tercer caso presentaba puntos radio opacos difusos intralesionales. El tratamiento consistió en realizar la exéresis-biopsia de las lesiones, efectuándose dos casos mediante bisturífrío y uno con láser de CO2. Uno de los casos presentó tres episodios de recidiva en el seguimiento postoperatorio (AU)

The peripheral ossifying fibroma (POF) is a reactive gingival disorder known under the generic term of epulis and is widely considered to originate from the cells of the periodontal ligament. It manifests as a tumor of firm consistency, well circumscribed, pink or red and is usually located in the incisor-canine area of the maxilla, being uncommon occurrence in edentulous alveolar ridges. Appears without ages difference, with a higher incidence between the second and third decades of life, with a slight predilection for females. It is a soft tissue injury, which can sometimes be associated with a slight erosion of the underlying bone surface. We have reviewed 3 cases of POF involving 2 men and 1 woman aged between 39 and 73 years, presenting one of them in edentulous alveolar ridge. In two cases showed radiological slight erosion of the underlying bone and the third case showed diffuse intralesional radiopaque points. Treatment consisted on resection of the lesions and biopsy of them, two cases to be carried out by cold scalpel and a CO2 laser. One case presented three episodes of recurrence in the postoperative follow (AU)

Revisión bibliográfica de Implantología Bucofacialdel año 2007 / Bibliographical review of Oral Implantology of the year 2007

Se expone una revisión de la literatura científica publicada en revistas indexadas durante el año 2007 sobre Implantología Bucofacial. La escasez de tiempo de que disponen los profesionales para consultar las múltiples fuentes de información, ha motivado a los autores a resumirlos artículos publicados y clasificarlos en los siguientes apartados: generalidades, pacientes especiales, superficies y diseños, tejidos blandos, implantes inmediatos, carga inmediata, complicaciones, elevación sinusal, técnicas avanzadas, plasma rico en plaquetas y factores de crecimiento, cirugía guiada, cirugía mínimamente invasiva y mini implantes, con la intención de facilitar una puesta al día (AU)

The lack of the available time of the professionals involved in the Odontological field and the difficulty to maintain a good level of information about Oral Implantology, arouse the interest of the authors to expose a synthetic review of the publications. Inside this article there are different aspects related to treatment planning, special patients, design and surfaces, immediateload, PRP, guided surgery and others (AU)